Rockwell Automation 42BT User Manual

Installation Instructions

Bulletin 42BT Long-Range Background Suppression

SAVE THESE INSTRUCTIONS FOR FUTURE USE.

Refer to the product catalog pages for additional information.

Description

The Allen-Bradley 42BT family of long-range background suppression is designed for the reliable detection of objects while ignoring background reflectivity.

These sensors also provide consistent detection of objec ts regardless of color at a specifically taught distance.

Features

S Visible light source for ease of alignment (1 m models)

S Range indicator allows for an easy readout of the settings

S Adjustable range settings

S Two sensing ranges: 1 m (3.28 ft) and 2 m (6.56 ft)

S Highly visible LED indicators

S Both NPN and PNP Outputs

S Compact IP65 rated enclosure

Sensor User Interface

Range Adjustment

Display

Margin

Indicator

Output

Indicator

LED Status

Green

Red

 LED is ON when sensor is in light operate (L.O.) mode and a target is detected, LED is OFF

when the sensor is in dark operate (D.O.) mode and the target is detected.

OFF Low stability. Light intensity below 1.2X

ON High stability. Light intensity above 1.2X

OFF Output OFF

Light/Dark

Operate Switch

Range Adjustment

Selector

Output ON 

Specifications

Certifications cULus and CE marked for all applicable directives

Environmental

Operating Environment IP65

Operating Temperature [C (F)]

Vibration 10…55Hz, 1.5 mm amplitude; meets or exceeds IEC

Shock 30 g with 1 ms pulse duration, meets or exceeds IEC

Relative Humidity 35…85%

Ambient Light Immunity Incandescent light: 3000 lux; sunlight: 10,000 lux

Optical

Models Sensing Range Light Source

42BT--B2LBSL--* 0.2…1 m (0.66…3.28 ft) Visible red (650 nm)

42BT--B1LBSL--* 0.2…2 m (0.66…6.56 ft) Infrared (880 nm)

Adjustments 5--turn sensitivity potentiometer

Electrical

Voltage 12…24V DC

Current Consumption 30 mA max

Sensor Protection Reverse polarity, short circuit

Outputs

Response Time 2msmax.

Output Type PNP or NPN

Output Mode Light and dark operate selectable

Output Current 100 mA max.

Mechanical

Housing Material Polyarilate

Lens Material Polyarilate

Connection Types 2 m cable, 4-pin DC micro (M12) pigtail, 4-pin DC pico

Supplied Accessories None

Optional Accessories Mounting brackets, cordsets

-- 2 5 …+55° (--13…131°)

60947--5--2

(M8) pigtail

Background Suppression Installation Considerations

Target

Note: Due to the detection method, targets traveling

horizontally to the sensor’s optics are detected. Targets traveling vertically may not be accurately detected. For reliable background suppression, a minimum separation distance of 6 mm is recommended between the target and the background.

Adjustment with no Background Present

1. Using an instrument screwdriver, adjust the suppression point to its minimum setting by turning the knob counterclockwise until a “click” can be heard.

2. The background suppression cutoff point for the 42BT sensor may be set between 200 mm and a maximum of 2 m (depending on the model)

3. If no background is present up to the maximum rated distance (1 m for 42BT--B2LBSL--F4 and 2 m for 42BT--B1LBSN--F4), the suppression point should be set just after the target to be sensed. Do this by rotating the knob clockwise with the target present until both indicators (stability and output) turn ON counterclockwise until both LEDs turn OFF

. Then rotate the knob

. When using

this method, ensure that the stability indicator (Green LED) is ON.

4. The sensor is now configured to detect targets between the sensor face and the suppression point. Note that the reflectivity of the target and the background will influence the detection capability of the sensor. Use the included response curves to help characterize the

sensor s

performance.

 Selector switch in light operate (L.O.) mode. For dark operate (D.O.) mode, the stability LED

turns ON and output LED turns OFF.

 Selector switch in light operate (L.O.) mode. For dark operate (D.O.) mode, the stability LED

turns OFF and output LED turns ON.

Mounting the Sensor

Securely mount the sensor on a firm, stable surface or support. An application which is subject to excessive vibration or shifting may cause intermittent operation. For installation convenience, we offer a wide range of mounting brackets. See the Accessories section for more details.

Sensor Adjustment

Once securely installed, the sensing range of the sensor must be set using the five-turn adjustment knob on the top of the sensor. This knob is used to set the suppression point (point at which the background will be suppressed) of the sensor.

Adjustment with Background Present

1. Using an instrument screwdriver, adjust the suppression point to its minimum setting by turning the knob counterclockwise until a “click” can be heard.

2. The background suppression cutoff point for the 42BT sensor may be set between 200 mm and a maximum of 2 m (depending on the model)

3. If a background is present up to the maximum rated distance (1 m for 42BT--B2LBSL--F4 and 2 m for 42BT--B1LBSN--F4), the suppression point should be set just before this background to allow detection of targets up to that point. Do this by rotating the knob clockwise until both indicators (stability and output) turn ON the knob counterclockwise until both LEDs turn OFF

 Selector switch in light operate (L.O.) mode. For dark operate (D.O.) mode, the stability LED

turns ON and output LED turns OFF.

 Selector switch in light operate (L.O.) mode. For dark operate (D.O.) mode, the stability LED

turns OFF and output LED turns ON.

. Then rotate

.

Wiring Diagrams

Quick disconnect connection is shown in the following diagrams. Pin numbers correspond to male connectors on the sensor.

Micro (M12) Male QD on Pigtail

Pico (M8) Male QD on Pigtail

NPN and PNP Outputs

Quick-Disconnect

Brown Black

White

Blue

Approximate Dimensions [mm (in.)]

57.5

(2.26)

(1.57)

2--4.2 (0.17)

20.5 (0.80)

Dia.

2 m cabl e

4.2 (0.17) Dia.

Axis

(0.78)

15 ( 0.59)

(2.75)

5.5 (0. 21)

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